Antiperspirant products comprising active antiperspirant compounds surface treated with hydrophobizing agents and methods for manufacturing the same

ABSTRACT

Antiperspirant products comprising active antiperspirant compounds surface treated with hydrophobizing agents and methods for manufacturing such products are provided. In accordance with an exemplary embodiment, an antiperspirant product comprises a hydrophobic carrier and an active antiperspirant compound with a coating of a hydrophobizing agent.

FIELD OF THE INVENTION

The present invention generally relates to antiperspirant products andmethods for manufacturing antiperspirant products, and more particularlyrelates to antiperspirant products comprising active antiperspirantcompounds surface treated with hydrophobizing agents and methods formanufacturing the same.

BACKGROUND OF THE INVENTION

Antiperspirants are popular personal care products used to prevent oreliminate perspiration and body odor caused by perspiration.Antiperspirant sticks are desired by a large majority of the populationbecause of the presence of active antiperspirant compounds that minimizeor prevent the secretion of perspiration by blocking or plugging ductsof sweat-secreting glands, such as those located at the underarms.Antiperspirants typically comprise an active antiperspirant compound ina carrier that permits the antiperspirant product to be applied to theskin by swiping or rubbing the stick across the skin, typically of theunderarm. Upon application, the carrier evaporates, releasing the activeantiperspirant compound from the antiperspirant product to form plugs inthe sweat ducts.

However, present day antiperspirant products present several drawbacks.For example, antiperspirant users often find antiperspirant productsabrasive and/or irritating to the skin and are disappointed in thestickiness and slipperiness of the solid wax stick across the skin. Inaddition, the amount of the active antiperspirant compound inantiperspirant products is limited. The active antiperspirant compoundsin antiperspirant products can be costly. In addition, the United StatesFood and Drug Administration has limited the amount of activeantiperspirant compound that can be added to an antiperspirant productbefore the product is considered “clinical” and available only byprescription. Thus, methods are needed to enhance the effectiveness ofactive antiperspirant compounds without adding additional activeantiperspirant compounds.

Accordingly, it is desirable to provide antiperspirant products thathave enhanced antiperspirant efficacy. It is also desirable to provideantiperspirant products that have improved skin feel. In addition, it isdesirable to provide methods for manufacturing such antiperspirantproducts. Furthermore, other desirable features and characteristics ofthe present invention will become apparent from the subsequent detaileddescription of the invention and the appended claims, taken inconjunction with the accompanying drawings and this background of theinvention.

BRIEF SUMMARY OF THE INVENTION

Antiperspirant products comprising active antiperspirant compoundssurface treated with hydrophobizing agents and methods for manufacturingsuch products are provided. In accordance with an exemplary embodiment,an antiperspirant product comprises an active antiperspirant compoundwith a coating of a hydrophobizing agent and a hydrophobic carrier.

In accordance with another exemplary embodiment, a method formanufacturing an antiperspirant product comprises combining an activeantiperspirant compound coated with a hydrophobizing agent and a carrierat a first temperature to form a mixture. At a second temperature lessthan the first temperature, the mixture is poured into molds and themixture is cooled to a third temperature less than the secondtemperature.

In accordance with a further exemplary embodiment, an antiperspirantproduct comprises an active antiperspirant compound with a coating of ahydrophobizing agent, a hydrophobic carrier, stearyl alcohol,hydrogenated castor oil, and a suspending agent.

DETAILED DESCRIPTION OF THE INVENTION

The following detailed description of the invention is merely exemplaryin nature and is not intended to limit the invention or the applicationand uses of the invention. Furthermore, there is no intention to bebound by any theory presented in the preceding background of theinvention or the following detailed description of the invention.

The various embodiments contemplated herein relate to an antiperspirantproduct with enhanced antiperspirant efficacy. In addition, oralternatively, various embodiments exhibit improved “skin feel.” Thatis, when applied to the skin of a user, the antiperspirant productexhibits reduced slipperiness, i.e., reduced slip between the underarms,and improved glide. The term “glide” typically is used to denote theperceived friction between the antiperspirant product and the skin. Thesmoother the glide, or the less friction between the product and theskin, the more desirable the product is to users. It unexpectedly hasbeen found that antiperspirant products that exhibit enhancedantiperspirant efficacy and/or improved skin feel can be achieved whenmanufactured with an active antiperspirant compound that has beensurface treated with a hydrophobizing agent.

In this regard, the various embodiments of the antiperspirant productscomprise a water-soluble active antiperspirant compound. Activeantiperspirant compounds contain at least one active ingredient,typically metal salts, that are thought to reduce perspiration bydiffusing through the sweat ducts of apocrine glands (sweat glandsresponsible for body odor) and hydrolyzing in the sweat ducts, wherethey combine with proteins to form an amorphous metal hydroxideagglomerate, plugging the sweat ducts so perspiration cannot diffuse tothe skin surface. Some active antiperspirant compounds that may be usedin the antiperspirant product include astringent metallic salts,especially inorganic and organic salts of aluminum, zirconium, and zinc,as well as mixtures thereof. Particularly preferred arealuminum-containing and/or zirconium-containing salts or materials, suchas aluminum halides, aluminum chlorohydrates, aluminum hydroxyhalides,zirconyl oxyhalides, zirconyl hydroxyhalides, and mixtures thereof.Exemplary aluminum salts include those having the general formulaAl₂(OH)_(a)Cl_(b) x (H₂O), wherein a is from 2 to about 5; a and b totalto about 6; x is from 1 to about 6; and wherein a, b, and x may havenon-integer values. Exemplary zirconium salts include those having thegeneral formula ZrO(OH)_(2-a)Cl_(a) x (H₂O), wherein a is from about 1.5to about 1.87, x is from about 1 to about 7, and wherein a and x mayboth have non-integer values. Particularly preferred zirconium salts arethose complexes that additionally contain aluminum and glycine, commonlyknown as ZAG complexes. These ZAG complexes contain aluminumchlorohydroxide and zirconyl hydroxy chloride conforming to theabove-described formulas. Examples of active antiperspirant compoundssuitable for use in the various embodiments contemplated herein includealuminum dichlorohydrate, aluminum-zirconium octachlorohydrate, aluminumsesquichlorohydrate, aluminum chiorohydrex propylene glycol complex,aluminum dichlorohydrex propylene glycol complex, aluminumsesquichlorohydrex propylene glycol complex, aluminum chiorohydrexpolyethylene glycol complex, aluminum dichlorohydrex polyethylene glycolcomplex, aluminum sesquichlorohydrex polyethylene glycol complex,aluminum-zirconium trichiorohydrate, aluminum zirconiumtetrachlorohydrate, aluminum zirconium pentachlorohydrate, aluminumzirconium octachlorohydrate, aluminum zirconium trichlorohydrex glycinecomplex, aluminum zirconium tetrachlorohydrex glycine complex, aluminumzirconium pentachlorohydrex glycine complex, aluminum zirconiumoctachlorohydrex glycine complex, zirconium chlorohydrate, aluminumchloride, aluminum sulfate buffered, and the like, and mixtures thereof.In a preferred embodiment, the active antiperspirant compound isaluminum zirconium trichlorohydrex glycine complex, aluminum zirconiumpentachlorohydrex glycine complex, aluminum zirconium tetrachlorohydrateglycine complex, or aluminum zirconium octachlorohydrex glycine complex.In a more preferred embodiment, the antiperspirant product comprises anactive antiperspirant compound at an active level of about 8 to about 30wt. % (USP) of the total antiperspirant product. As used herein, weightpercent (USP) or wt. % (USP) of an antiperspirant salt is calculated asanhydrous weight percent in accordance with the U.S.P. method, as iswell known in the art. This calculation excludes any bound water andglycine. In a most preferred embodiment, the antiperspirant productcomprises about 10 to about 25 wt. % (USP) aluminum zirconiumpentachlorohydrex glycine complex or aluminum zirconium trichlorohydrexglycine complex.

As noted above, the active antiperspirant compound has a surface thathas been surface treated with a hydrophobizing agent. Typically, when anantiperspirant user begins to perspire and perspiration is released fromsweat glands, particles of the active antiperspirant compound diffuseinto the sweat glands and hydrolyze, where they form a plug to plug thesweat gland. However, by surface treating the active antiperspirantcompound with the hydrophobizing agent, the particles of the activeantiperspirant compound are made more hydrophobic than untreatedparticles. In this regard, the hydrophobizing agent delays hydrolyzationof the particles, thus permitting the particles to diffuse deeper intothe sweat glands before forming plugs, and more effectively preventingperspiration. The hydrophobization agent comprises any material thatincreases the hydrophobicity of the active antiperspirant compound andthat does not adversely affect the phase, thermal or chemical stabilityof the resulting antiperspirant product. In a preferred embodiment, thehydrophobizing agent comprises isopropyl titanium triisostearate (ITT),methicones, such as, for example hydrogen dimethicone,trimethylsiloxysilicate, or any combination thereof. In one embodiment,the active antiperspirant compound is coated with the hydrophobizationagent in an amount of from about 0.2 to about 5 wt. % of theantiperspirant product. Preferably, the active antiperspirant compoundis coated with about 1 to about 2 wt. % of the hydrophobizing agent.

Further included in the antiperspirant product is at least onestructurant and/or gellant (hereinafter referred collectively as“structurant”) that facilitates the solid consistency of theantiperspirant stick product. Naturally-occurring or synthetic waxymaterials or combinations thereof can be used as such structurants.Suitable structurants, including waxes and gellants, are often selectedfrom fatty alcohols often containing from 12 to 30 carbons, such asstearyl alcohol, behenyl alcohol and sterols such as lanosterol. As usedherein, the term “fatty” means a long chain aliphatic group, such as atleast 8 or 12 linear carbons, which is frequently not branched (linear)and is typically saturated, but which can alternatively be branchedand/or unsaturated. It is possible for the fatty acid to contain ahydroxyl group, as in 12-hydroxystearic acid, for example as part of agellant combination, and to employ amido or ester derivates thereof.

Other structurants can comprise hydrocarbon waxes such as paraffinwaxes, microcrystalline waxes, ceresin, squalene, and polyethylenewaxes. Other suitable structurants are waxes derived or obtained fromplants or animals such as hydrogenated castor oil, hydrogenated soybeanoil, carnabau, spermacetti, candelilla, beeswax, modified beeswaxes, andMontan wax and individual waxy components thereof. It is especiallysuitable herein to employ a mixture of wax structurants. Suitablemixtures of structurants can reduce the visibility of activeantiperspirant compounds deposited on the skin and result in either asoft solid or a firm solid. In an exemplary embodiment, thesurfactant(s) comprise about 10 to about 35 wt. % of the totalantiperspirant product. In a preferred embodiment, the antiperspirantproduct comprises a mixture of stearyl alcohol and hydrogenated castoroil. In a more preferred embodiment, the antiperspirant productcomprises about 12 to about 25 wt. % stearyl alcohol and about 1.5 toabout 7 wt. % hydrogenated castor oil. In a most preferred embodiment,the antiperspirant product comprises about 15-22 wt. % stearyl alcoholand about 2.8 wt. % hydrogenated castor oil.

The antiperspirant products also may comprise a high refractive index(R.I.) hydrophobic compound. As used herein, the term “high refractiveindex” means a refractive index of no less than about 1.4. The high R.I.hydrophobic compound also facilitates the minimization and/or preventionof a white residue on the skin by masking the active antiperspirant saltthat stays upon the skin upon evaporation of a carrier, described inmore detail below. Examples of high R.I. hydrophobic compounds for usein the antiperspirant products include PPG-14 butyl ether, C₁₂-C₁₅ alkylbenzoate, such as Finsolv TN® available from Innospec of the UnitedKingdom, and phenyl dimethicone. In a preferred embodiment, theantiperspirant product comprises PPG-14 butyl ether and, in a morepreferred embodiment, the antiperspirant product comprises PPG-14 butylether in an amount of about 5 to about 15 wt. % of the totalantiperspirant product.

In another exemplary embodiment, the antiperspirant product comprisesone or more suspending agents that facilitate suspension of the activeantiperspirant compound in the antiperspirant product, therebyminimizing the amount of active antiperspirant compound that settles outof the antiperspirant product during manufacture. Suitable suspendingagents include clays and silicas. Examples of suitable silicas includefumed silicas and silica derivatives, such as silica dimethyl silylate.Suitable clays include bentonites, hectorites and colloidal magnesiumaluminum silicates. In one exemplary embodiment, the antiperspirantproduct comprises about 0.2 to about 2.5 wt. % suspending agents. Inanother exemplary embodiment, the antiperspirant product comprises amixture of silica and silica dimethyl silylate. In a preferredembodiment, the antiperspirant product comprises from about 0.1-0.5 wt.% silica and from about 0.1 to about 2 wt. % silica dimethyl silylate.

In addition to the ingredients identified above, the antiperspirantproduct may comprise additives, such as those used in conventionalantiperspirants. These additives include, but are not limited to,fragrances, including encapsulated fragrances, dyes, pigments,preservatives, antioxidants, moisturizers, and the like. These optionalingredients can be included in the antiperspirant product in an amountof from 0 to about 20 wt. %. In a preferred embodiment, theantiperspirant product comprises myristyl myristate, which provides aconditioning effect to the skin.

The antiperspirant product further comprises at least one hydrophobiccarrier. An example of suitable hydrophobic carriers includes liquidsiloxanes and particularly volatile polyorganosiloxanes, that is, liquidmaterials having a measurable vapor pressure at ambient conditions. Thepolyorganosiloxanes can be linear or cyclic or mixtures thereof. Thelinear volatile silicones generally have viscosities of less than about5 centistokes at 25° C., while the cyclic volatile silicones haveviscosities under 10 centistokes. Preferred siloxanes includecyclomethicones, which have from about 3 to about 6 silicon atoms, suchas cyclotetramethicone, cyclopentamethicone, and cyclohexamethicone, andmixtures thereof The carrier also may comprise, additionally oralternatively, nonvolatile silicones such as dimethicone and dimethiconecopolyols, which have from about 2 to about 9 silicon atoms. Examples ofsuitable dimethicone and dimethicone copolyols include polyalkylsiloxanes, polyalkylaryl siloxanes, and polyether siloxane copolymers.

Various methods can be used to coat particles of an activeantiperspirant compound with a hydrophobizing agent. In one exemplaryembodiment, the active antiperspirant compound is combined with a liquidmedium sufficient to form a slurry and the hydrophobizing agent. Liquidmediums suitable for forming a slurry with the active antiperspirantcompound include, but are not limited to, isopropyl alcohol, heptane,isoheptane, isooctane, isononane, petroleum distillates such as thoseavailable from Phillips Chemical under the trade names or trademarksSoltrol 130, Soltrol 150 and Soltrol 170, and combinations thereof Theslurry is thoroughly mixed and then filtered. The filtered, coatedactive antiperspirant compound is then dried to remove the solvent andany byproduct from the surface. Drying is preferably performed attemperatures in the range of from about 60 to about 90° C., as theactive antiperspirant compound may be unstable at temperatures above 90°C. Drying can be achieved passively by exposure to the ambientatmosphere, by using heat for a time effective to yield a dry powder, byvacuum, or the like.

In another exemplary embodiment for surface treating an activeantiperspirant compound, a mixture of the hydrophobizing agent and theliquid medium and, optionally, the active antiperspirant compound, issprayed onto a fluidized or agitated filler bed of active antiperspirantcompound. The sprayed active antiperspirant compound is then transferredto a blender and mixing, preferably high shear mixing, is performed fora time sufficient to permit coating of the active antiperspirantcompound. The coated active antiperspirant compound is then removed fromthe blender, filtered if necessary, and dried to remove the solvent andany byproduct from the surface. Again, drying is preferably performed attemperatures in the range of from about 60 to about 90° C., as theactive antiperspirant compound may be unstable at temperatures above 90°C. Drying can be achieved passively by exposure to the ambientatmosphere, by using heat for a time effective to yield a dry powder, byvacuum, or the like.

The antiperspirant product, according to various embodiments, can beprepared by combining an active antiperspirant compound coated with ahydrophobizing agent and a carrier at 65-75° C. to form a mixture,pouring the mixture into molds at about 52° C., and cooling the mixtureto room temperature. In a preferred embodiment, manufacture of theantiperspirant product includes combining suspending agents in thecarrier. Any suitable form of mixing can be used to combine theingredients, such as high shear mixing, stirring, agitation, blending,or any combination thereof. The surface-treated active antiperspirantcompound is added to the suspending agents and carrier to form a premix.Mixing continues until the premix is homogenous and fluid inconsistency. In another mixing vessel, the structurants and the highrefractive index (R.I.) hydrophobic compound, if used, are added andheat not exceeding 85° C. is applied to melt the ingredients. As theingredients melt, agitation is slowly commenced. The mixture is cooledto 64-69° C., if necessary, and, with continuous agitation, the premixis incrementally added to the mixture until the mixture is homogenous.Additional carrier is added to the mixture with agitation such that themixture is maintained at a temperature of 60° C. Additives, such asfragrance, dyes, corn starch, etc. are added with mixing whilemaintaining the mixture at 60° C. The final mixture is cooled to 52° C.,poured into molds, and then allowed to cool to room temperature. As usedherein, the term “allowed to cool” means exposing the mixture to roomtemperature for a time sufficient for the mixture to come to roomtemperature or exposing the mixture to a refrigerator or cooling room,fan, or other cooling mechanism that lowers the temperature of themixture to room temperature.

The following are exemplary embodiments of an antiperspirant productcontemplated herein, with each of the components set forth in weightpercent of the antiperspirant product. The examples are provided forillustration purposes only and are not meant to limit the variousembodiments of the antiperspirant product in any way.

EXAMPLE 1

Ingredient Wt. % Cyclopentasiloxane 40.95 AAZG-531-ITT1 22.76 StearylAlcohol 20.00 PPG-14 butyl ether 9.80 Hydrogenated castor oil 2.84Myristyl Myristate 1.92 Silica dimethyl silylate 1.38 Silica 0.35 Total100.00,where AAZG-531-ITT1 is aluminum zirconium trichlorohydrex glycinecomplex (AAZG-531) surface treated with 1 wt % ITT. AAZG-531 isavailable from Summit Reheis of Huguenot, N.Y.

EXAMPLE 2

Ingredient Wt. % Cyclopentasiloxane 40.72 AAZG-531-TMS2 22.99 StearylAlcohol 20.00 PPG-14 butyl ether 9.80 Hydrogenated castor oil 2.84Myristyl Myristate 1.92 Silica dimethyl silylate 1.38 Silica 0.35 Total100.00,where AAZG-531-TMS2 is the active antiperspirant compound (AAZG-531)surface treated with 2 wt% trimethylsiloxysilicate.

EXAMPLE 3

Ingredient Wt. % Cyclopentasiloxane 40.72 AAZG-531-DMC2 22.99 StearylAlcohol 20.00 PPG-14 butyl ether 9.80 Hydrogenated castor oil 2.84Myristyl Myristate 1.92 Silica dimethyl silylate 1.38 Silica 0.35 Total100.00,where AAZG-531-DMC2 is the active antiperspirant compound (AAZG-531)surface treated with 2 wt % hydrogen dimethicone.

Examples 1, 2, and 3 were prepared by coating AAZG-531 with ITT,trimethylsiloxysilicate, and hydrogen dimethicone, respectively. About90% of the cyclopentasiloxane was added to a mixing container andagitation was initiated. With continuous agitation, the silica and thesilica dimethyl silylate were added incrementally to thecyclopentasiloxane until the silicas were wetted. Next, utilizing highshear mixing, a premix was formed by incrementally adding thesurface-treated active antiperspirant compound until the premix had aconsistently fluid appearance void of any particulates.

In another mixing container, the hydrogenated castor oil, stearylalcohol, PPG-14 butyl ether, and myristyl myristate were added and heatwas slowly initiated to melt the components while agitation wasperformed as the mix became molten. The temperature of the mixture didnot exceed 85° C. With continuous agitation, the premix wasincrementally added while the mixture was maintained at a batchtemperature of from about 64 to about 69° C. Agitation was continueduntil the mixture was homogeneous. The remainder of thecyclopentasiloxane was added to the mixture with agitation, while themixture was maintained at a temperature of about 60° C. The mixture wascooled to about 52° C., and then was poured into molds and allowed tocool to room temperature.

Accordingly, antiperspirant products with active antiperspirantcompounds surface treated with hydrophobizing agents have been provided.In various embodiments, the antiperspirant products exhibit enhancedantiperspirant efficacy. In addition, or alternatively, theantiperspirant products exhibit improved “skin feel.” That is, whenapplied to the skin of a user, the antiperspirant product exhibitsreduced slipperiness, i.e., reduced slip between the underarms, andimproved glide. The antiperspirant products also exhibit improvedevenness of coverage. While at least one exemplary embodiment has beenpresented in the foregoing detailed description of the invention, itshould be appreciated that a vast number of variations exist. It shouldalso be appreciated that the exemplary embodiment or exemplaryembodiments are only examples, and are not intended to limit the scope,applicability, or configuration of the invention in any way. Rather, theforegoing detailed description will provide those skilled in the artwith a convenient road map for implementing an exemplary embodiment ofthe invention, it being understood that various changes may be made inthe function and arrangement of elements described in an exemplaryembodiment without departing from the scope of the invention as setforth in the appended claims and their legal equivalents.

What is claimed is:
 1. An antiperspirant product comprising: an activeantiperspirant compound with a coating of a hydrophobizing agent; and ahydrophobic carrier.
 2. The antiperspirant product of claim 1, whereinthe hydrophobizing agent comprises a material selected from the groupconsisting of isopropyl titanium triisostearate (ITT), methicones,trimethylsiloxysilicate, and any combination thereof.
 3. Theantiperspirant product of claim 1, wherein the active antiperspirantcompound is coated with the hydrophobizing agent in an amount of fromabout 0.2 to about 5 wt. % of the antiperspirant product.
 4. Theantiperspirant product of claim 3, wherein the active antiperspirantcompound is coated with the hydrophobizing agent in an amount of fromabout 1 to about 2 wt. % of the antiperspirant product.
 5. Theantiperspirant product of claim 1, wherein the hydrophobic carriercomprises siloxanes.
 6. The antiperspirant product of claim 5, whereinthe hydrophobic carrier comprises a cyclomethicone.
 7. Theantiperspirant product of claim 1, further comprising a structurant. 8.The antiperspirant product of claim 7, wherein the structurant isstearyl alcohol.
 9. The antiperspirant product of claim 1, wherein theactive antiperspirant compound comprises a material selected from thegroup consisting of aluminum zirconium trichlorohydrex glycine complex,aluminum zirconium pentachlorohydrex glycine complex, aluminum zirconiumtetrachlorohydrate glycine complex, and aluminum zirconiumoctachlorohydrex glycine complex.
 10. The antiperspirant product ofclaim 1, wherein the active antiperspirant compound is present in anamount of from about 10 to about 25 wt. % of the antiperspirant product.11. A method for manufacturing an antiperspirant product, the methodcomprising the steps of: combining an active antiperspirant compoundsurface treated with a hydrophobizing agent and a carrier at a firsttemperature to form a mixture; pouring into molds the mixture at asecond temperature that is less than the first temperature; and coolingthe mixture to a third temperature that is less than the secondtemperature.
 12. The method of claim 11, wherein the step of combiningcomprises combining the active antiperspirant compound comprising amaterial selected from the group consisting of aluminum zirconiumtrichlorohydrex glycine complex, aluminum zirconium pentachlorohydrexglycine complex, aluminum zirconium tetrachlorhydrate glycine complex,and aluminum zirconium octachlorohydrex glycine complex surface treatedwith the hydrophobizing agent and the carrier at the first temperatureto form the mixture.
 13. The method of claim 11, wherein the step ofcombining comprises combining the active antiperspirant compound in anamount of from about 10 to about 25 wt. % of the antiperspirant product.14. The method of claim 11, wherein the step of combining comprisescombining the carrier with the active antiperspirant compound surfacetreated with a material selected from the group consisting of isopropyltitanium triisostearate (ITT), methicones, trimethylsiloxysilicate, andany combination thereof
 15. The method of claim 11, wherein the step ofcombining comprises combining the carrier with the active antiperspirantcompound surface treated with the hydrophobizing agent in an amount offrom about 0.2 to about 5 wt. % of the antiperspirant product.
 16. Themethod of claim 11, wherein the step of combining comprises: combiningsuspending agents, the active antiperspirant compound surface treatedwith the hydrophobizing agent, and the carrier to form a premix; andadding the premix to a molten structurant to form the mixture.
 17. Anantiperspirant product comprising: an active antiperspirant compoundsurface treated with a hydrophobizing agent; a hydrophobic carrier;stearyl alcohol; hydrogenated castor oil; and a suspending agent. 18.The antiperspirant product of claim 17, wherein the hydrophobizing agentcomprises a material selected from the group consisting of isopropyltitanium triisostearate (ITT), methicones, trimethylsiloxysilicate, andany combination thereof.
 19. The antiperspirant product of claim 17,wherein the active antiperspirant compound is coated with thehydrophobizing agent in an amount of from about 0.2 to about 5 wt. % ofthe antiperspirant product.
 20. The antiperspirant product of claim 19,wherein the active antiperspirant compound is coated with thehydrophobizing agent in an amount of from about 1 to about 2 wt. % ofthe antiperspirant product.